Z80 Computer CPU Card (USB Code Loader)

     The 1730 is a Z80 CPU card with a Z84C0008VEC processor and 64kB of SRAM.  This card uses a USB interface to upload code from a hex file into 64K of flash that is then programmed into the SRAM at each power up cycle.  The SRAM is then loaded using DMA after which the bus is released and reset de-asserted to allow the Z80 to operate normally.

Features

• 3.0 inch wide by 2.5 inch high 4 layer PWB
• 8MHz Z84C0008VEC CMOS Z80 CPU
• 64kB of flash (10k write endurance) for non-volatile program storage that is up-loadable via USB in about 10S
• Flash is transferred to SRAM after upload and after each board power up in about 50mS
• Programmable clock from DC to 8MHz with the ability to halt and single step via serial link
• When the Z80 is halted, any portion of the SRAM can be downloaded over the serial link
• 64kB of SRAM that serves as both the ROM and RAM for the Z80 CPU
• LCD interface mapped to IO port addresses 0b1xxx xxx0 (Control write) and 0b1xxx xxx1 (Data read and write)
• Reset button controls Z80 reset directly
• All Z80 pins are connected to 40 pin dual row socket at bottom of card
• Can be plugged into the Z80 Backplane for expansion and debugging
• Prototyping can be accomplished with the Backplane Proto Card that has pads on a 0.1 inch grid and space for up to four 40 pin DIPs or many more smaller packages
• Signals can be examined visually with the Backplane Signal Watcher or the Piggy Back Backplane Signal Watcher (Allows slot to be used by a plug in card on top of the viewer so the viewer doesn't take up the slot)
• Power supplied by USB Mini-B connection (With or without USB data interface) or from the 5V/2A regulator on the backplane (7 to 35V input)
• Free ZDevStudio assembler available: See Z80 resource page